NEWYou can now listen to Fox News articles! Graham Platner, the populist Democratic Senate nominee in Maine, is in a virtual dead heat in a crucial Senate showdown with longtime Republican Sen. Susan Collins, according to a new poll.Platner, the embattled candidate who has been facing a slew of controversies, stands at 49% support among likely voters questioned in a New York Times/Portland Press Herald/Siena poll released on Monday, with Collins at 47%, and 3% of respondents undecided or refusing to answer. Platner's two-point edge is within the survey's sampling error, meaning the contest is virtually tied.Collins, a moderate Republican...